Sorry make so, System > Preferences > Install Theme and chose a new mouse theme for install. and for change a mouse, System > Preferences > Appearance > Select the Theme tab > Click Customise > Select the Pointer tab.

Install Mouse Theme

Download the theme and extract it where ever you want. Go to system-preferences-appearance. Open where you extracted the theme to, and drag the theme into appearances. It will come up with a message. Click customize and go to pointer and click on the mouse theme. Log in and log out.

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